L-system Modeling in Searching Heterophylly Morphogenesis of Three Aquatic Plants
Date Issued
2012
Date
2012
Author(s)
Chin, Chih-Haou
Abstract
Heterophylly observed in some aquatic plants which have different shapes of leaves while emerged or submerged. The shapes of the heterophyll of aquatic plants change when they encounter different environments but not age of plants. The purpose of aquatic plants heterophylly is to adapt the environments from air to water and the opposite direction. The exchange of gas is harder in water than in air, so plants need special leaves to survive in water. Some researches show that there are some factors leading the aquatic plants to form the heterophyll, including ethylene, blue light and ABA. The factors have different dosage relationships with heterophyll in different species. The heterophyll of submerged is thinner than emerged in some aquatic plants, Rotala rotundifolia for example. The notch of submerged heterophyll is deeper than emerged one, Proserpinaca palustris for example. Some heterophylly even changes the phyllotaxy, such as Limnophila aquatic. The reason that the plants have different growth rates in different light density and photoperiodism is because their original nature habitats are different. And the reason can lead aquatic plants to have different adaptability in aquarium. We can use L-system to simulate the growth situations of aquatic plants in aquarium, and it can also predict the view of aquarium. L-system is a theory about describing the growth situations of organism by mathematic, including axioms, rewriting rules, turtle graphics. Due to the progress of molecular biology, we have known a lot of DNA sequences of organism. The DNA between different organisms are different, it produces different genetics messages, and shapes the organism. From the view point of L-system, we propose that the basic form of plant organ is similar, and the different appearances are due to the parameters’ changes in different environment. If we can find the relationship between DNA sequences and the parameters of L-system, as well as the basic form of organism by L-system. We can simulate the shapes of organism by DNA sequences.
Subjects
L-system
heterophylly
amphibious plants
Type
thesis
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